"Disperse" is not the right word ... you're thinking of dropoff. Wide dispersion is the #1 selling point of the Bose. The Nano definitely drops off quicker than the Bose. It also does not have the width of coverage. They sound very good if you are in the line of sight area, but the Bose is still the better performer to get the sound into the nooks and crannies. There'll be a few Nanos for sale after a while ... Done will think he's going deaf!